Update documentation for configuring replication (#303)
Update documentation for configuring replication (#303)

Motivation:

We did not update our documentation for configuring replication since we
embedded ZooKeeper.

Modifications:

- Updated the documentation for configuring replication.
- Miscellaneous:
  - Updated the outdated client code sample in TLS configuration.

Result:

Up-to-date docs
line/centraldogma,line/centraldogma,line/centraldogma,line/centraldogma,line/centraldogma